I was told that Chrome uses the most ram, but according to this little test i just carried out firefox seems to be worst of the 3, the exact same 10 tabs
How to reduce Chrome memory usage & make it use less memory
How to Reduce Google Chrome's Memory Usage and Free Up RAM
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Fix High RAM Memory Usages By Google Chrome | Make Chrome Faster - YouTube
Google Chrome gets memory- and power-saving modes | Computerworld
How to reduce Chrome memory usage & make it use less memory
Fix: Google Chrome Ran Out Of Memory
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How to Make Chrome Use Less RAM and CPU
Sluggish Browser? Here's How to Speed Up Google Chrome | PCMag
How To Limit Google Chrome Memory Usage And Free Up RAM | Geekman